Orbitestellidae
                              Architectonicoidea
                                    Architectonicidae
                                    Mathildidae
                                    Omalaxidae
                              Cimoidea
                                    Cimidae
                              Glacidorboidea
                                    Glacidorbidae
                              Omalogyroidea
                                    Omalogyridae
                              Pyramidelloidea
                                    Amathinidae
                                    Pyramidellidae
                              Ringiculoidea
                                    Ringiculidae
                              Rissoelloidea
                                    Rissoellidae
                              Valvatoidea
                                    Valvatidae
                  Umbraculida
                              Umbraculoidea
                                    Tylodinidae
                                    Umbraculidae
            Opisthobranchia
                  Anaspidea
                              Aplysioidea
                                    Aplysiidae
                  Cephalaspidea
                              Acteonoidea
                                    Acteonidae
                                    Aplustridae
                                    Bullinidae
                              Bulloidea
                                    Bullidae
                              Cylindrobulloidea
                                    Cylindrobullidae
                              Diaphanoidea
                                    Diaphanidae
                              Haminoeoidea
                                    Haminoeidae
                                    Smaragdinellidae
                              Philinoidea
                                    Aglajidae
                                    Akeridae
                                    Cylichnidae
                                    Gastropteridae
                                    Philinidae
                                    Retusidae
                                    Scaphandridae
                  Gymnosomata
                              Clionoidea
                                    Clionidae
                                    Cliopsidae
                                    Pneumodermatidae
                  Nudibranchia
                              Aeolidioidea
                                    Aeolidiidae
                                    Facelinidae
                                    Favorinidae
                                    Flabellinidae
                                    Glaucidae
                              Arminoidea
                                    Arminidae
                              Dendronotoidea
                                    Dendronotidae
                                    Dotidae
                                    Embletoniidae
                                    Lomanotidae
                                    Tethyidae
                              Doridoidea
                                    Archidorididae
                                    Cadlinidae
                                    Chromodorididae
                                    Discodorididae
                                    Dorididae
                                    Geitodorididae
                                    Rostangidae
                              Fionoidea
                                    Fionidae
                                    Tergipedidae
                              Onchidoridoidea
                                    Corambidae
                                    Goniodorididae
                                    Onchidorididae
                              Phyllidioidea
                                    Dendrodorididae
                                    Phyllidiidae
                              Polyceroidea
                                    Gymnodorididae
                                    Hexabranchidae
                                    Polyceridae
                              Tritonioidea
                                    Bornellidae
                                    Phylliroidae
                                    Scyllaeidae
                                    Tethydidae
                                    Tritoniidae
                  Nudipleura
                              Pleurobranchoidea
                                    Pleurobranchidae
                  Sacoglossa
                              Elysioidea
                                    Caliphyllidae
                                    Elysiidae
                                    Stiligeridae
                              Julioidea
                                    Juliidae
                              Oxynooidea
                                    Oxynoidae
                                    Volvatellidae
                              Placobranchoidea
                                    Placobranchidae
                  Thecosomata
                              Cavolinioidea
                                    Cavoliniidae
                                    Limacinidae
                              Cymbulioidea
                                    Cymbuliidae
                                    Peraclidae
            Pulmonata
                  Basommatophora
                              Amphiboloidea
                                    Amphibolidae
                              Ancyloidea
                                    Acroloxidae
                                    Ancylidae
                                    Physidae
                                    Planorbidae
                              Chilinoidea
                                    Chilinidae
                                    Latiidae
                              Ellobioidea
                                    Carychiidae
                                    Ellobiidae
                                    Otinidae
                              Lymnaeoidea
                                    Lymnaeidae
                              Siphonarioidea
                                    Siphonariidae
                                    Trimusculidae
                  Stylommatophora
                              Acavoidea
                                    Acavidae
                                    Caryodidae
                                    Clavatoridae
                              Achatinelloidea
                                    Achatinellidae
                              Achatinoidea
                                    Achatinidae
                                    Ferussaciidae
                                    Megaspiridae
                                    Subulinidae
                              Ariophantoidea
                                    Ariophantidae
                                    Euconulidae
                                    Helicarionidae
                                    Trochomorphidae
                                    Urocyclidae
                              Athoracophoroidea
                                    Athoracophoridae
                              Bulimuloidea
                                    Amphibulimidae
                                    Bulimulidae
                                    Cerionidae
                                    Odontostomidae
                                    Orthalicidae
                                    Urocoptidae
                              Clausilioidea
                                    Clausiliidae
                              Endodontoidea
                                    Arionidae
                                    Charopidae
                                    Discidae
                                    Endodontidae
                                    Helicodiscidae
                                    Philomycidae
                                    Punctidae
                              Gastrodontoidea
                                    Chronidae
                              Helicoidea
                                    Bradybaenidae
                                    Camaenidae
                                    Cochlicellidae
                                    Elonidae
                                    Epiphragmophoridae
                                    Helicidae
                                    Helminthoglyptidae
                                    Hygromiidae
                                    Oreohelicidae
                                    Pleurodontidae
                              Oleacinoidea
                                    Oleacinidae
                                    Spiraxidae
                              Partuloidea
                                    Draparnaudiidae
                                    Partulidae
                              Plectopyloidea
                                    Corillidae
                                    Plectopylidae
                              Polygyroidea (sf)
                                    Polygyridae
                                    Sagdidae
                                    Thysanophoridae
                              Pupilloidea
                                    Amastridae
                                    Argnidae
                                    Chondrinidae
                                    Cochlicopidae
                                    Enidae
                                    Hypselostomatidae
                                    Orculidae
                                    Pleurodiscidae
                                    Pupillidae
                                    Pyramidulidae
                                    Strobilopsidae
                                    Valloniidae
                                    Vertiginidae
                              Rhytidoidea
                                    Scolodontidae
                              Streptaxoidea
                                    Ammonitellidae
                                    Chlamydephoridae
                                    Haplotrematidae
                                    Rhytididae
                                    Streptaxidae
                              Strophocheiloidea
                                    Dorcasiidae
                                    Megalobulimidae
                                    Strophocheilidae
                              Succineoidea
                                    Succineidae
                              Testacelloidea
                                    Testacellidae
                              Zonitoidea
                                    Daudebardiidae
                                    Gastrodontidae
                                    Godwiniidae
                                    Limacidae
                                    Milacidae
                                    Oxychilidae
                                    Parmacellidae
                                    Pristilomatidae
                                    Vitrinidae
                                    Zonitidae
                  Systellommatophora
                              Onchidioidea
                                    Onchidiidae
                              Veronicelloidea
                                    Rathouisiidae
                                    Veronicellidae